Bun has been acquired by Anthropic, which plans to leverage Bun's technology for its AI coding tools like Claude Code and Claude Agent SDK. The acquisition won't change Bun's open-source status, active maintenance, or team structure. Bun will remain focused on high-performance JavaScript tooling and Node.js compatibility, while also being integrated more closely with Anthropic's future projects. This partnership aims to enhance the efficiency of coding tools and accelerate Bun's development. Bun's journey began nearly five years ago when its creator, Jarred Sumner, sought to improve the slow iteration times in developing a browser-based game. His efforts evolved into a fast JavaScript runtime and bundler, culminating in the launch of Bun v1.0 in July 2022. Since then, Bun has seen significant growth, raising $26 million and expanding its team. The latest versions added support for Windows and improved compatibility with Node.js, which has led to increased production usage from companies like Midjourney and Tailwind. The article emphasizes the rapid evolution of AI coding tools, which have become increasingly useful in recent years. Bun's architecture allows for the creation of self-contained binaries, making it ideal for distributing CLI tools. As AI agents take on more coding tasks, the infrastructure around these tools gains importance. The acquisition by Anthropic positions Bun at the forefront of this shift, allowing it to focus on developing advanced JavaScript tooling without the typical pressures of monetization.